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MCCL Distributed PyTorch training across MacBooks via Thunderbolt
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GitHub Repository
Use your Intel iMac as an external display for Apple Silicon Macs — free, open source, via Thunderbolt Bridge
163 starsSwift
TargetBridge – Use an Intel iMac as a Thunderbolt Display Apple Macs
by targetbridge·Jul 11, 2026·3 points·0 comments
AI Analysis
●●●BangerNiche GemSolve My Problem
Brings back Target Display Mode for Apple Silicon Macs without buying a $1,000 Studio Display.
Strengths
- •Virtual display mode lets you extend desktop, not just mirror, which Apple never supported.
- •Input Dockstation relays keyboard and mouse back to sender Mac for single-workstation control.
- •Automatic receiver discovery over Bonjour and multi-receiver layouts for complex setups.
Weaknesses
- •Requires physical Thunderbolt cable; experimental Network Link transport is still unreliable.
- •Only works with Intel iMac receivers from 2014 or newer, excluding older hardware.
Category
Target Audience
Mac developers and power users with old iMacs
Similar To
Luna Display · Duet Display · Apple Target Display Mode
Post Description
I built TargetBridge, a free and open-source alternative for using an Intel iMac as a display from an Apple Silicon Mac over Thunderbolt.
It creates a virtual display on the sender and streams it to a receiver app on the iMac. It supports mirror mode, extended desktop, multiple receivers, audio, input relay, and hardware-free receiver smoke tests.
It is a software solution, not Apple Target Display Mode, so it requires a real Thunderbolt connection and macOS Big Sur or newer on the receiver.
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